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21.2. Let f(n) and g(n) be functions from N→R. Prove or disprove the following statements. (a)...

21.2. Let f(n) and g(n) be functions from N→R. Prove or disprove the following statements.

(a) f(n) = O(g(n)) implies g(n) = O(f(n)).

(c) f(n)=?(g(n)) if and only if (n)=O(g(n)) and g(n)=O(f(n)).

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